Wiring Forward and Reversing Motor Starters with Superimposed Schematics 

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Using the contact blocks on the contactor will allow the motor to come to a stop before reversing. This in most cases would be the preferred method. If you want the motor to reverse immediately, then the button contacts would be the method you would choose. It all depends on how you want the system to work. Thanks for the comment!

The contactor keeps you from reversing direction while the motor is spinning and prevents damage from polarity reversing while the motor is still engaged. Using only the start/stop switches doesn’t prevent this; there’s no lockout mechanism as with the contactor. The sudden change in polarity causes heat to the windings of the motor causing unnecessary heat damage which is really the bottom line. Industrial motors configured with Wye Delta start and run is another way they have helped extend the life of a motor and make it more efficient. It starts at a lower voltage in Wye and switches to Delta high voltage at a certain speed to help reduce heat in start up by starting in a lower voltage and then switching to high voltage at an optimal speed. It helps extend the life of the motor and make it run more efficiently as well. That’s the purpose of the overload heaters as well; it senses excessive heat in the circuit from overloading or starting issues! A circuit breaker disconnects for a short or ground fault; a heater disengages when it senses overheating. Just demonstrates that the breaker, starter and overload or heater all have different functions as well as the stop/start with forward and reverse controls with the contactors.

It’s called Constructor

Here is a playlist on VFD function wiring and programming. But limited to 525’s . VFD Programming and Design ru-vid.com/group/PLBUvFVo2Dw492bC8ywv9Jw6Hk2rw4G6zj